2x-x＾2+8≥0
    （x-3）/2<1-（2x-1）/4
    （x-3）/2＜1-（2x-1）/4
    （X-3）/2＜1-（2X-1/4）
    (i+1)^7-1>2.5*i*(1+i)^7
    (i+1)^7-1>3.333*i*(1+i)^7
    (i+1)^7-1<4.167*i*(1+i)^7
    3.333<(i+1)^7-1/i*(1+i)^7<4.167
    200x（x+15）≥0
    4x+6＜5
    3x-7＞5
    3x-7＞5
    (y/1700)-(y/5100)<0.1
    (x/340)-(x/5100)<0.1
    74x^2-273.096x-39.641>0
    x（1+x＾2）＾1/2-x＾2>-1
    ex（cosx-sinx）＞1
    xe（cosx-sinx）＞1
    ex（cosx-sinx）＞1
    2^a-a<√2-0.5

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